#  Copyright 2019-2020 The Lux Authors.
# 
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

from __future__ import annotations
from typing import List, Union, Callable, Dict
from lux.history.event import Event
class History():
	"""
	History maintains a list of past Pandas operations performed on the dataframe
	Currently only supports custom overridden functions (head, tail, info, describe)
	"""
	def __init__(self):
		self._events=[]
	
	def __getitem__(self, key):
		return self._events[key]
	def __setitem__(self, key, value):
		self._events[key] = value
	def __len__(self):
		return len(self._events)
	def __repr__(self):
		event_repr=[]
		for event in self._events:
			event_repr.append(event.__repr__())
		return "["+'\n'.join(event_repr)+"]"
	def append_event(self,name,*args,**kwargs):
		event = Event(name,*args,**kwargs)
		self._events.append(event)